$1.73 = \sqrt {n(n + 2)} $
On calculating the value of $n$ we find $n=1$
No. of unpaired electrons $= 1$
hence its consfiguration will be
$V(23) = [Ar] 3d^3\,4s^2$
$V^{4+} = [Ar]3d^1$
Its chloride has the formula $VCl_4$
$(I)$ ગલન બિંદુ $(II)$ ઉત્કલન બિંદુ $(III)$ ઘનતા